operation vs psychological science

operation and psychological science both are nouns.

Word	Noun	Adjective	Verb	Adverb
operation	Yes	No	No	No
psychological science	Yes	No	No	No

operation (noun)	psychological science (noun)
a medical procedure involving an incision with instruments; performed to repair damage or arrest disease in a living body	the science of mental life
(mathematics) calculation by mathematical methods
activity by a military or naval force (as a maneuver or campaign)
a planned activity involving many people performing various actions
a process or series of acts especially of a practical or mechanical nature involved in a particular form of work
a business especially one run on a large scale
the activity of operating something (a machine or business etc.)
(psychology) the performance of some composite cognitive activity; an operation that affects mental contents
(computer science) data processing in which the result is completely specified by a rule (especially the processing that results from a single instruction)
process or manner of functioning or operating
the state of being in effect or being operative